You can define a 2D array in Java as follows : Instead of one bracket, you will use two e.g. If you know how to create a one-dimensional array and the fact that multi-dimensional arrays are just an array of the array in Java, then creating a 2-dimensional array is very easy. How to Declare 2 Dimensional Array in Java? Example You can not change the length of an array, I mean, the number of rows and columns will remain fixed. Similar to the one-dimensional array, the length of the two-dimensional array is also fixed. a multidimensional array can have 2 columns in one row and 3 columns in a second. This is unlike languages like C or FORTRAN, which allows Java arrays to have rows of varying lengths i.e. Java truly doesn't support a multi-dimensional array but allows you to create and use an array of any number of dimensional.Ī two-dimensional array is actually an array of one-dimensional array. In other words, each row in a two-dimensional array is a one-dimensional array. Similarly to represent 3x2 matrices you need 2 two-dimensional arrays of a one-dimensional array of length 3. For example to represent a 3x3 matrix you need a two-dimensional array of 3 one-dimensional arrays each containing 3 elements. Now the question comes when to use a multi-dimensional array? Any real-life example? Well, 2D arrays are very common on platform games like Super Mario Bros to represent screen or terrain 2D arrays can also be used to represent structures like a spreadsheet, or to draw board games like Chess, which requires an 8x8 board, Checkers and Tic-Tac-Toe, which requires 3 rows and 3 columns.Īnother popular application of multi-dimensional arrays is in matrix manipulation. I have never seen 4-dimensional arrays, even 3D arrays are not that common.
Two of the most common examples of multi-dimensional arrays are two and three-dimensional arrays, known as 2D and 3D arrays, anything above is rare. An array of more than one dimension is known as a multi-dimensional array.
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